Seiko Cal. 4428 - 103

This Hand-Winding model from 1965 features a 43mm Hardlex-Coated Steel case. Powered by the 4428 caliber with 36j jewels beating at 28,800 bph, it delivers a 67 hours power reserve. [seikata-wm-171f65b9eae8]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

15.7mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

Navy

Jewels

36j

Frequency

28,800 bph

Power Reserve

67 hours

Year

1965

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